IMPROVEMENTS IN AND RELATING TO SPLITTING APPARATUS

Abstract: Apparatus for splitting blocks, the apparatus comprising a base (1) which supports a blade (2) with its splitting edge protruding a distance no greater than 0.5 mm above the base surface, guide ways (4) upstanding from the base (1) and positioned one to each side of the blade (2), and an opposite bladed member (5, 6) movable between and within the guide ways (4) along a vertical path which contains the respective edges of the blade (2) and the bladed member (5, 6). The surface of the base (1) is formed with corrugations (3) which extend in a direction normal to the edge of the blade (2). The base includes an upstanding wall lying to one side of the blade (2) and being provided with markings in the form of a rule.

Description: Improvements in and relating to Splitting Apparatus This invention relates to apparatus for splitting a building block, brick, paving stone, coping stone, pathway block or the like (hereinafter referred to simply as "blocks") into two or more pieces. More especially the invention is directed to apparatus for splitting a block to produce a smaller block of a required length. When using such items as internal thermal blocks for building, for example, an internal wall of a house, it is more than likely that a significant number of blocks will need to be cut to length. Hitherto such blocks have conventionally been cut using either a saw or a bolster and hammer to create stress lines across the block width. Similar methods are presently employed to cut other types of bricks, stones and blocks as referred to above. To use a saw to cut building blocks to length is both time consuming and unpleasant because of the high volume of dust created. With experience, blocks to an approximate size can be cut using a bolster and hammer. However the length of block produced is often imprecise and damage often occurs to the edges of the block. Without experience, attempts to split building blocks using a bolster and hammer are frequently unsuccessful. The present invention sets out to provide splitting apparatus which enables blocks to be consistently and accurately cut to length. According to the present invention in one aspect there is provided apparatus for splitting blocks, the apparatus comprising a base which supports a blade with its splitting edge protruding a distance no greater than 0.5mm above the base surface, guide ways upstanding from the base and positioned one to each side of the blade, and a bladed member movable between and within the guide ways along a substantially vertical path which contains the respective edges of the blade and the bladed member. The blade whose edge protrudes from the base of the apparatus is preferably a continuous blade which extends across at least the major part of the width of the base. The splitting edge of the blade is preferably tapered and the blade may be removable from the base. The height of the cutting edge of the blade above the surface of the base may be of the order of between 2mm and 4mm; a typical height is 3mm. The base may be generally horizontal and may be formed in a single piece. Alternatively, the base may be formed in two or more separate sections each of which may be inclined one with another. The surface of the base may be generally flat or may be formed with corrugations which extend in a direction generally normal to the splitting edge of the blade. The base may include markings in the form of a rule to indicate the distance between a marked point or line and the protruding splitting edge of the blade. The surface of the base may include to one or each of its sides an upstanding member or wall whose end face lies to one side of the protruding splitting edge of the blade. This member or wall may include markings in the form of a rule. The invention will now be described by way of example only with reference to the accompanying diagrammatic drawings in which:- Figure 1 is a side view of apparatus in accordance with the invention with a block to be split supported thereby; and Figure 2 is a plan view from above of the apparatus and block illustrated in Figure 1. The apparatus illustrated in Figures 1 and 2 includes a base 1 produced from wood, metal or other suitable material. A blade 2 is supported by the base and is formed with a splitting edge which protrudes a small distance above the base surface and which extends across the entire width of the base surface. The base 1 is formed with a plurality of corrugations 3 which extend in a direction generally normal to the splitting edge of the blade 2. In an alternative construction, the blade extends over only a major part of the base width. The blade 2 is formed with a tapered edge and is located within a suitably shaped slot formed in the corrugations of the base 1. In the arrangement illustrated, the blade 2 can selectively be removed, reversed and replaced. Alternatively, the blade 2 may be formed integrally with the base. As shown the blade 2 is positioned closer to one end of the base 1 than the other. In a preferred arrangement, the blade 2 is positioned at a distance of, for example, 5|" from the right hand end of the base 1 for producing split blocks for use as returns and reveals. As mentioned previously, the blade 2 protrudes a relatively small height above the base surface, this height being no greater than 5mm and being preferably between 2 and 4mm. A typical height is 3mm or %". The base may be marked with linear measurements to provide a measure of distance from the blade 2. Upstanding guideways 4 are provided to each side of the base for receiving and retaining a bladed member 5. The path defined by the guideways 4 extends generally vertically between the splitting edge of the blade 2 and the upper extent of the guideways passing through the edges of the bladed member 6. The member 5 includes a head 6. A block 7 to be cut is shown positioned on the base. In use of the apparatus illustrated, the block 7 is positioned on the base 1 and rests on the splitting edge of the blade 2 with the blade immediately below the intended fracture plane of the block. The measurement markings are provided to ensure that the block is correctly positioned on the base . The bladed member 5 is then located within the guideways 4 and placed with its edge in contact with the upper face of the block immediately above the intended fracture plane of the block. At this time, the splitting edge of the blade 2 and blade member 5 lie generally in a common vertical plane. The head 6 is then struck using,for example, a hammer to cause the block to fracture about the plane containing the edge of the blade 2 and the edge of the bladed member 5. The small distance which the splitting edge of the blade 2 protrudes above the surface of the base 1 has been found to be critical for consistently effecting a clean fracture of a block about its intended fracture plane. If this distance is greater than 0.5mm, consistent clean fractures are not possible. Use of the apparatus in the manner described consistently produces split blocks of a required length. Means may be provided to support the underside of a block where, for example, only a very small (e.g. 1") needs to be sheared from the block end. The support may be provided by, for example, a layer of sand or like material. It will be appreciated that the foregoing is merely exemplary of the apparatus in accordance with the invention and that modifications can readily be made thereto without departing from the true scope of the invention.

Claims: CLAIMS 1. Apparatus for splitting blocks, the apparatus comprising a base which supports a blade with its splitting edge protruding a distance no greater than 0.5mm above the base surface, guide ways upstanding from the base and positioned one to each side of the blade, and a bladed member movable between and within the guide ways along a substantially vertical path which contains the respective edges of the blade and the bladed member. 2. Apparatus as claimed in claim 1 wherein the blade whose edge protrudes from the base of the apparatus is a continuous blade which extends across at least the major part of the width of the base. 3. Apparatus as claimed in claim 1 or 2 wherein the splitting edge of the blade is tapered. 4. Apparatus as claimed in any one of claims 1 to 3 wherein the blade is removable from the base. 5. Apparatus as claimed in any one of the preceding claims wherein the height of the cutting edge of the blade above the surface of the base is of the order of between 2mm and 4mm. 6. Apparatus as claimed in any one of the preceding claims wherein the base is generally horizontal and is formed as a single piece. 7. Apparatus as claimed in any one of claims 1 to 5 wherein the base is formed in two or more separate sections each of which is inclined one with another. 8. Apparatus as claimed in any one of the preceding claims wherein the surface of the base is generally flat. 9. Apparatus as claimed in any one of claims 1 to 7 wherein the surface of the base is formed with corrugations which extend in a direction generally normal to the splitting edge of the blade. 10. Apparatus as claimed in any one of the preceding claims wherein the base includes markings to indicate the distance between a marked point or line and the protruding splitting edge of the blade. 11. Apparatus as claimed in any one of the preceding claims wherein the surface of the base includes along one or each of its sides an upstanding member or wall whose end face lies to one side of the protruding splitting edge of the blade. 12. Apparatus as claimed in claim 11 wherein the member or wall includes markings in the form of a rule.

Inventors: BEVAN DAVID MAURICE, BEVAN, DAVID, MAURICE
Applicants: BEVAN DAVID MAURICE, BEVAN, DAVID, MAURICE
Application year: 1994
Main classification: B28D1
IPC codes: B28D1, B28D7